That's the airfield from which the United States believes the government of Syrian President Bashar al-Assad fired the banned weapons.
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"We feel that the strike itself was proportional, because it was targeted at the facility that delivered this most recent chemical weapons attack," Tillerson told reporters on Thursday night.
Jeff Davis, a spokesman for the Defense Department, said initial assessments showed that the airfield was severely damaged, reducing Syria's capability to deliver chemical weapons.
Tillerson and Nikki Haley, the U.S. ambassador to the United Nations, have bluntly blamed Syria for the chemical weapons attack, whose victims included at least 25 children.
McMaster said the missile strike wouldn't have wiped out Assad's "capacity to commit mass murder with chemical weapons."